I'm on MacOS 15.6, and FFox 142. My company recently rolled out "PSSO" for Mac users, and it works pretty well on non-Microsoft sites. However, when accessing resources behind MS Azure/Entra, such as outlook.com, sharepoint, even github, we get the following error from "login.microsoftonliine.com": '''''You can't get there from here''' Your sign-in was successful, but you can't open this resource from this web browser. You might be able to access it from the Safari browser (ask your IT department for a list of approved mobile and desktop applications).'' All of these worked fine before PSSO while using Yubikeys (in fact I plan to revert to Yubikey next week). The IT department says that Mozilla needs to implement this, referencing the "only applies on Windows" statement shown on https://support.mozilla.org/en-US/kb/windows-sso . They (and I) have demonstrated that it also works just as intended on Chrome and Edge browsers. And yet, we see that "Microsoft SSO" was added in FFox 132: https://bugzilla.mozilla.org/show_bug.cgi?id=1768724 Who needs to do what to make this work on Microsoft web-apps?